Atrios fills us in with a bit of history:
"One things that's sort of entertaining is that back when I first started doing online politics stuff conservatives basically controlled the online discourse. They were always "freeping" online polls and always spoofing amazon reviews. CNN had an online chat which was moderated by arch-conservatives who basically banned any liberals that dared showed up. Now that our side is engaging in some of the same tactics everyone is suddenly getting the vapors."